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Method for preparing P type molecular sieve by using coal ash as raw material

A fly ash and molecular sieve technology, applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problems of high production cost and long preparation cycle, achieve the effects of short crystallization time, reduce synthesis cost and increase yield

Inactive Publication Date: 2015-01-21
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing P-type molecular sieves using fly ash as a raw material. This method for preparing P-type molecular sieves using fly ash as a raw material is used to solve the long preparation cycle and production problems of the current method for preparing P-type molecular sieves. high cost problem

Method used

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  • Method for preparing P type molecular sieve by using coal ash as raw material
  • Method for preparing P type molecular sieve by using coal ash as raw material
  • Method for preparing P type molecular sieve by using coal ash as raw material

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Embodiment 1

[0027] Grind the fly ash into fine powder, pass through a 200-mesh sieve, put it in a muffle furnace, calcinate at 800°C for 3 hours, wash it twice with water at a temperature of 75°C and a speed of 200r / min, each time 1.5 h, and then carry out solid-liquid separation of the washing liquid and fly ash, and dry the separated solid at 120°C for 5 hours for later use; the pretreated fly ash and Na 2 CO 3 The solid mass ratio is 1:1 and mixed evenly. After roasting at 800°C for 1 hour, take it out and cool it to 25°C for later use; then impregnate the roasted product with 5 mol / L HCl for 120 minutes, filter to remove insoluble matter, and obtain silica-rich gel and crude AlCl 3 solution. Adjust crude AlCl with 5mol / L NaOH 3 pH value of the solution to 3.8, filtered to remove Fe(OH) 3 , the filtrate continued to add NaOH dropwise until the precipitation in the filtrate no longer increased, and the Mg(OH) was removed by filtration. 2 Waiting for other insoluble matter, the pH v...

Embodiment 2

[0031] Grind the fly ash into fine powder, pass through a 200-mesh sieve, place it in a muffle furnace, calcinate at 750°C for 3 hours, then wash it with water three times at a temperature of 75°C and a speed of 300r / min. 1.5h, and then carry out solid-liquid separation between the washing liquid and the fly ash, and the separated solid is dried at 120°C for 5 hours for later use; the pretreated fly ash and Na 2 CO 3 Mix evenly at a mass ratio of 1:1.5, roast at 700°C for 2 hours, take out and cool to 25°C for later use; then impregnate the roasted product with 4mol / L HCl for 120min, filter to remove insoluble matter, and obtain silica-rich gel and crude AlCl 3 solution. Adjust crude AlCl with 4mol / L NaOH 3 pH of the solution to 4.0, filtered to remove Fe(OH) 3 , the filtrate continued to add NaOH dropwise until the precipitation in the filtrate no longer increased, and the Mg(OH) was removed by filtration. 2 Waiting for other insoluble matter, the pH value of filtrate is...

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Abstract

The invention relates to a method for preparing a P type molecular sieve by using coal ash as a raw material. The method for preparing the P type molecular sieve by using coal ash as the raw material comprises the following steps: I, pre-treating and activating coal ash; II, preparing sodium silicate and sodium metaaluminate by using activated coal ash; and III, synthesizing the P type molecular sieve: firstly, uniformly mixing a sodium silicate solution with a sodium salt, then, dropwise adding the sodium metaaluminate solution into the mixed liquid, and finally, adding an organic steric hindering agent and a proper amount of deionized water to form a reaction mixture, wherein the molar ratios of the reaction mixture are as follows: SiO2 / Al2O3=0.4-1.8, M / Al2O3=1-5, Na2O / Al2O3=2-4 and H2O / SiO2=20-150 and the organic spatial steric hindering agent is at least one of ethanol amine, diethanol amine and triethanol amine; packing the mixed materials in a polytetrafluoroethylene container, stirring, then putting in a stainless steel reaction kettle, and carrying out hydro-thermal synthesis for 2-8 hours; and taking out products in the reaction kettle, carrying out centrifugal separation and washing by deionized water, and drying to obtain the P type molecular sieve. The method provided by the invention is short in synthetic cost, short in crystallization time and high in yield of the P type molecular sieve.

Description

technical field [0001] The invention relates to a molecular sieve synthesis method, in particular to a method for preparing a P-type molecular sieve by using fly ash as a raw material. Background technique [0002] P-type molecular sieve has a clinline zeolite framework structure, and the pores in its eight-membered ring structure are composed of two-dimensional channels of 0.31nm × 0.44nm and 0.26nm × 0.49nm. Or the performance of liquid, it is often used in industry to deal with toxic radioactive elements in sewage, and to prepare environmentally friendly cleaning agents. P-type molecular sieve has good selectivity and ion exchange performance for calcium, magnesium and potassium ions in aqueous solution, and its unique mesopore structure makes it have a high adsorption capacity of non-ionic surfactants, which can improve a certain amount of detergent in detergents. Therefore, P-type molecular sieves are widely used in the fields of detergent builders, water treatment and...

Claims

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Application Information

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IPC IPC(8): C01B39/02
CPCC01B39/04C01P2002/72C01P2004/03
Inventor 陈彦广解骢浩李治淼韩洪晶李锋宋军
Owner NORTHEAST GASOLINEEUM UNIV
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